I had a hard time getting him to pay up.

我好不容易让他还清了全部欠款。

We claimed a refund from the association, but they would not pay up.

我们向该协会要求退款，但他们不肯把钱吐出来。

They are willing to pay up to $500 more for cars that get better mileage.

他们愿意多付$500来买单位汽油里程数更高的汽车。

He'll never pay up unless you get tough with him.

你如果不对他强硬点， 他是决不会把钱付清的。

The sponsor threatened not to pay up.

赞助商以不付款为要挟。